1) х/3 + х/2 = х/6 + 1
2х/6 + 3х/6 = х/6 + 1
5х/6 - х/6 = 1
4х/6 = 1
2х/3 = 1
2х = 1 * 3
2х = 3
х = 3/2
х = 1,5
2) у/2 - у/8 = у/4 - 1
4у/8 - у/8 = у/4 - 1
3у/8 = у/4 - 1
3у/8 - у/4 = - 1
3у/8 - 2у/8 = - 1
у/8 = - 1
у = - 1 * 8
у = - 8
3) 5х/12 - 4х/15 = х/20 + 1
25х/60 - 16х/60 = х/20 + 1
9х/60 = х/20 + 1
3х/20 = х/20 + 1
3х/20 - х/20 = 1
2х/20 = 1
х/10 = 1
х = 1 * 10
х = 10
4) х/3 - 2х/9 = х/6 + 1/2
3х/9 - 2х/9 = х/6 + 1/2
х/9 = х/6 + 1/2
х/9 - х/6 = 1/2
2х/18 - 3х/18 = 1/2
- х/18 = 1/2
-х = 1/2 * 18
-х = 9
х = - 9